public MemberAnnotationHandler getHandlerForMemberAnnotation(String annotationName) {
if (memberAnnotationHandlerAnnotations == null
|| !memberAnnotationHandlerAnnotations.contains(annotationName)) {
return null;
}
MemberAnnotationHandler handler = memberAnnotationHandlers.get(annotationName);
if (handler == null) {
// Try to create this MemberAnnotationHandler
try {
PluginManager pluginMgr = metadataMgr.getNucleusContext().getPluginManager();
handler =
(MemberAnnotationHandler)
pluginMgr.createExecutableExtension(
"org.datanucleus.member_annotation_handler",
"annotation-class",
annotationName,
"handler",
null,
null);
memberAnnotationHandlers.put(annotationName, handler);
} catch (Exception e) {
NucleusLogger.METADATA.warn(
Localiser.msg("MetaData.MemberAnnotationHandlerNotFound", annotationName));
return null;
}
}
return handler;
}
/**
* Accessor for the MetaData for the specified class, read from annotations. The annotations can
* be of any supported type.
*
* @param cls The class
* @param pmd PackageMetaData to use as a parent
* @param clr ClassLoader resolver
* @return The ClassMetaData
*/
public AbstractClassMetaData getMetaDataForClass(
Class cls, PackageMetaData pmd, ClassLoaderResolver clr) {
if (cls == null) {
return null;
}
Annotation[] annotations = cls.getAnnotations();
if (annotations == null || annotations.length == 0) {
return null;
}
// Find an annotation reader for this classes annotations (if we have one)
String readerClassName = null;
for (int i = 0; i < annotations.length; i++) {
String reader = annotationReaderLookup.get(annotations[i].annotationType().getName());
if (reader != null) {
readerClassName = reader;
break;
}
}
if (readerClassName == null) {
NucleusLogger.METADATA.debug(Localiser.msg("044202", cls.getName()));
return null;
}
AnnotationReader reader = annotationReaders.get(readerClassName);
if (reader == null) {
// Try to create this AnnotationReader
try {
Class[] ctrArgs = new Class[] {ClassConstants.METADATA_MANAGER};
Object[] ctrParams = new Object[] {metadataMgr};
PluginManager pluginMgr = metadataMgr.getNucleusContext().getPluginManager();
reader =
(AnnotationReader)
pluginMgr.createExecutableExtension(
"org.datanucleus.annotations",
"reader",
readerClassName,
"reader",
ctrArgs,
ctrParams);
annotationReaders.put(
readerClassName,
reader); // Save the annotation reader in case we have more of this type
} catch (Exception e) {
NucleusLogger.METADATA.warn(
Localiser.msg("MetaData.AnnotationReaderNotFound", readerClassName));
return null;
}
}
return reader.getMetaDataForClass(cls, pmd, clr);
}
/**
* Constructor.
*
* @param metadataMgr Manager for MetaData
*/
public AnnotationManagerImpl(MetaDataManager metadataMgr) {
this.metadataMgr = metadataMgr;
PluginManager pluginMgr = metadataMgr.getNucleusContext().getPluginManager();
// Load up the registry of available annotation readers
ConfigurationElement[] elems =
pluginMgr.getConfigurationElementsForExtension("org.datanucleus.annotations", null, null);
if (elems != null) {
for (int i = 0; i < elems.length; i++) {
annotationReaderLookup.put(
elems[i].getAttribute("annotation-class"), elems[i].getAttribute("reader"));
}
}
// Load up the registry of available class annotation handlers
elems =
pluginMgr.getConfigurationElementsForExtension(
"org.datanucleus.class_annotation_handler", null, null);
if (elems != null && elems.length > 0) {
classAnnotationHandlerAnnotations = new HashSet<String>(elems.length);
classAnnotationHandlers = new HashMap<String, ClassAnnotationHandler>(elems.length);
for (int i = 0; i < elems.length; i++) {
classAnnotationHandlerAnnotations.add(elems[i].getAttribute("annotation-class"));
}
}
// Load up the registry of available member annotation handlers
elems =
pluginMgr.getConfigurationElementsForExtension(
"org.datanucleus.member_annotation_handler", null, null);
if (elems != null && elems.length > 0) {
memberAnnotationHandlerAnnotations = new HashSet<String>(elems.length);
memberAnnotationHandlers = new HashMap<String, MemberAnnotationHandler>(elems.length);
for (int i = 0; i < elems.length; i++) {
memberAnnotationHandlerAnnotations.add(elems[i].getAttribute("annotation-class"));
}
}
}